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d in (-oo:+oo)
3-((2/5)*d) = 161/55 // - 161/55
3-((2/5)*d)-(161/55) = 0
(-2/5)*d-161/55+3 = 0
4/55-2/5*d = 0 // - 4/55
-2/5*d = -4/55 // : -2/5
d = -4/55/(-2/5)
d = 2/11
d = 2/11
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